My imac wont startup after upgrating to mavericks

first the following screen appears, because the computer was not shut down properly:
and upon startup i see the following screen and it restarts with first screen
im hoping that someone can help!
Thank you very much

Hi nataliciz,
Thanks for visiting Apple Support Communities.
The information in this article can help with handling the screen you're seeing (which is called a "kernel panic":
OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem."
http://support.apple.com/kb/TS4636
Troubleshooting a recurring kernel panic
Diagnosing a recurring kernel panic can be difficult. If you need help with this process, consider bringing your Mac to a Genius at an Apple Store or an Apple Authorized Service Provider for help. If you plan to visit an Apple Retail store, you can make a reservation (available in some countries only).
Tip: To help diagnose recurring kernel panics, record the date and time it occurs, and any information that appears with the kernel panic message.
Was the computer starting up, shutting down, or performing a particular task when the recurring kernel panic happened?
Is the kernel panic intermittent, or does it happen every time you do a certain thing? For example, were you playing a particular game, or printing at the time?
Does it occur only when a certain external device is connected, or a device is connected to a certain port?
Isolate hardware or software as the cause of the issue
To try to figure out if the issue is related to software or hardware, use the computer with a fresh installation of OS X on an external drive.
Start the Mac from OS X Recovery.
If a kernel panic still occurs when started from Recovery, there is likely a hardware issue. See the "Hardware troubleshooting" section below for additional information.
Open Disk Utility and use "Repair Disk" on your Mac's internal hard drive (named Macintosh HD by default).
Important: If Disk Utility is unable to repair the internal drive, you should back up your important data immediately and if possible, reformat the drive. Consider bringing the Mac to a Genius at an Apple Store or an Apple Authorized Service Provider for further diagnosis. Be sure to ask that, if the drive needs reformatting or replacing, they contact you about escalating your case to a special data recovery service. If you plan to visit an Apple Retail store, you can make a reservation (available in some countries only).
Best,
Jeremy

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